Improvement in the manufacture of white lead



ffy. s. (Naf-mz ma@ ELEVATHON GROUND PLAN N To all whom it may concern: l

Specification i Be it known that I, JAMES`OUDDY, of

dPittsburg, Pennsylvania, have invented an ,Improvement in the Manufacture ofWhite Lead; and I do hereby declare the following to be a full, clear, and exactdescription of the same.

Mylinvention consistsin a cheap and rapid "method of converting metallic lead into white lead.`

` My invention further consists in an economical apparatus for showering vinegar or dilute acetic acid upon sheets of metallic leadspread upon the shelves within the casks, tubs, or otherround vessels or chambers, converting the same into an acetate of lead, and preparing it for the action of carbonic acid.

In 'order to enableothers to practice my l invention, I will: now proceed to describe a mode of carrying the sameinto e'ect, refer-H ence being had to the accompanying drawing',

`which forms a part of this specification, and in whichf l Figure 1 is an `elevation and crosssection lof an apparatus which may be used for carryingmypinventioninto effect. `ground plan of thesame. Fig. 3 is an improved form of slatfor shelves, one inch in depth,and having the lower surface one inch n wlde, and the upper surface one-quarter of an inch wide, by which-nearly-all the lower surfaces of the lead lare exposed to the action of s the gases within the :cask or casks, or round `vessels or chambers, anda more thorough decomposition of the metallic lead secured.

`A Aare casks, orother round vessels or woodmade of strips or slats, one inch apart,

`upon whichthin l sheets'of lead are laid.

`They are .then oxidized by a jet of steam ,gfrom the pipes@ C, afterwhich they receive l a shower of vinegar fromthe tub D(that stands upon anelevated platform, or in an upper story `of the building) through the wpipeE.. d,

`(Ihe upper portions ofthe branch pipes F F n arehollow or female screws, with` a narrow notchin 'front of` each,finto"which a strip of ED p PATENT ()Frrcno i por, rEuNsrLvANIA." 'Priorat/:ENT ru maniuac'ruun or WHITLBAIS.

thick glass -is secured, through which the operator is enabled to see the exact position of the lower pipes G G, which are male screws, each terminating in a rose or set of branching pipes, that are perforated with small holes, and marked H in the drawing.

By opening the stop cock in pipe F, and revolving the pipe G by a wrench or crank, a rotary motion is git en, that showers the vinegar equally over every portion of the lead upon each shelf.

Upon the stop-cock being closed and the pipe G either raised or lowered, as the case may require, the same operation may be repeated until the lead upon all the shelves has been treated in this manner, and thus, by regulating the pressure "in the pipe and the rotary motion of the cross-head through which the vinegar escapes, the casks being round and the cross-head in the center of the casks or chambers, every portion of the lead on the kled.

Another advantage of this mode of sprinkling arises from the fact that there is no necessity for opening the door of the cask or chamber during the operation, whereby the temperature would he diminished below the point required.

The dial-plate I, which stands on the top of the cask or chamber, is numbered to correL spond with the ranges of shelves in the interior, and thus insures economy and regularity in the showering of the vinegar upon the lead on the shelves, as the pipe G is raised or lowered by the operator.

1 do not confine myself to this precise constructionof a sprinkler, the above being but one form of its construction and operation.

A stream of carbonicacid gas is now driven into the cask, vessel, or chamber, through the pipe K, at a temperature ranging from 850 to 1000 of Fahrenheits thermometer, as I have or sixty feet long, that is kept covered by Water in a suitable tank.

.These operations are repeated until the manufacture of the White lead is nished,

` which will require about eight days.

3. The improved form of slat for the shelves, by which nearly all the under surfaces'of the sheets of lead are exposed to the action of the gases Within the cask or round chamber, for the purpose described.

4. The application of carbonio-acid gas at a temperature ranging from 850 to 1000 (eighty-five to one hundred degrees) of Fahrenheits thermometer, as and for the purpose described.

JAMES CUDDY.

a Witnesses:

WM. P. SHATTUCK, GEO. S. SELDEN. 

